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It's possible that the HP-55 was also supplied with the same plastic hard case used for the HP-45 and HP-65. I just checked the museum listing for the HP-55, and it shows one with accessories in a plastic hard case.
Also, I checked the HP-55 manuals and the Owner's handbook in Appendix A, page 85, states that the standard accessories include a "Travel Safety Case." However, the addenda for the manual printed February 1975 says to "delete the reference to the travel safety case." So, either the case was initally supplied and then later deleted to reduce cost, or it was never supplied in the first place. I also have an Owner's Handbook, dated December 1974, and the previous owner has lined out the travel safety case.
Edited: 2 June 2011, 8:45 p.m.